Is a cubic meter a SI unit?

Answer 1

m can mean milli or 10-3 and as such is a multiplier not a unit

m = mass (kg) or other is a fundamental and not a derived unit

M = moles is a fundamental unit

m = meter is a fundamental unit and not derived

Answer 2

The meter is an SI unit cubic meters are just the meter in more dimensions (3) and thus per se does not qualify for SI status.

Answer 3

Yes, but it is a derived unit, not a fundamental unit.

Answer 4

Yes.